Lifting-jack



J S- HOOD,

LIPTING JACK' Patented Nbv. 25, 1884.

. .INVENTOR Unirse JOSEPH S. HOOD, OF STAHLSTOVN, PENNSYLVANIA.

LIFTING-JACK.

SPECIFICATION forming partvof Letters Patent No. 308,361, dated November25. 1884.

Application Bled October 1, 1884.

To @ZZ whom, t may concern:

Be it known that I, JOSEPH S. HOOD, a citizen of the United States,residing at Stahlstown, in the county of Vestmoreland and State ofPennsylvania, have invented new and useful Improvements inLifting-Jacks, of

which the following is a specication, refery rable.

Vith these ends in view the invention consists in the combination, witha suitable supporting-frame, of a sliding rack, a suitablyjournaledgear-wheel, and a pivoted lever carrying a pivoted pawl to engage thesame.

The invention further consists-in the improved construction andcombinations of parts hereinafter fully described, and pointed out inthe claim. p

In the drawings, Figure -1 is a perspective view of a lifting-jackconstructed in accordance with my invention. Fig. 2 is .a longitudinalvertical section of the same, and Fig. 3 is a vertical transversesection.

In the accompanying drawings, in which like letters of referenceindicate corresponding parts in all the iigures, A represents a suitablesupporting-frame consisting of the vertical uprights a, connected attheir lower ends by a base-block, b, and at their upper ends by twostrips, c, each of said vertical uprights being provided on its innerside with a groove or channel, d, running its entire length from end toend.

B represents a bar having an outwardlyextending tongue, e, on each sidewhich ts in the grooves or Channels in the supportingframe. rlhe saidbar B is provided on its front face with a series of rack-teeth, f, andis provided on its rear side at the lower end thereof with anoutwardly-extending block, O.

At the upper end of the rack-bar B is pivoted a cross-strip, D, which,as will be read- (No model.)

ily seen, may be turned to any desired position or point.

Upon the front cross-strip, c, about midway between the two ends of thesame, is secured abracket, g, in which is pivoted apawl, h. This pawl his adapted to engage any one of the series of teeth f upon the rack-barB, and thus holdit to any point to which it may be raised. The pawl h isheld in engagement with the teeth upon the rack-bar B by means of acoil-spring, i, secured to the cross-strip c at one end and to the underside of the pawl at its other end.

Just below the front cross-strip,c,on each of the vertical uprights a issecured a bracket or box, j. Y,

E represents a shaft which has bearing in the bracketsj. Upon said shaftis mounted a gear-wheel, E', which engages the teeth f upon the bar B. Ahandle, F, divided at its end, is fitted upon the shaft E, said dividedend bearing against the sides of` the gearwheel E'.

Between the sides of the divided end of the handle F,near the rear endthereof, is pivoted a pawl or lever, G, said pawl or lever having a lug,k, which bears against the rear end of the divided end ot' the handle Fwhen the end of the lever or pawl is in engagement with the gear-wheelE', thus serving as ay stop.

The operation is as follows: The jack is placed under the object whichit is desired to raise and the handle F raised, the pivoted lever orpawl G sliding over or upon the teeth ot' the gear-wheel E. As soon asthe handle is raised to its fullest extent, which is a verticalposition, the pawl or lever G drops into engagement with the teeth ofthe gear-wheel E', and upon the handle F being pushed downwardly thegear-wheel E meshes with the teeth j' upon the bar B and raises thesame, the spring-pressed pawl preventing the downward movement of ythebar B by engaging the teeth of the same.

Then desired, my improved jack may be employed as a track-lifter. Inthis case the block upon the rear of the bar B is engaged with the underside of the tread of 'the track and the device operated, as beforedescribed.

A liftingjack constructed in accordance IOO with my inventionis simplein its eonstrueteeth f, a gearwheel, E, a handle, F, lever G, tion, maybe manufactured and supplied at a having lug` k, a pawl, and a spring tohold comparatively slight cost, and by its use a said pawl in engagementwith the teeth ofthe heavy or weighty object can be easily raisedrack-bar, substantially as set forth. i 5 5 With but a minimumexpenditure of power. .In testimony that I claim the foregoing as Havingfully described my invention, what my own I have hereto aiXed mysignature in I claim as new, and desire to secure by Letters presence oftwo Witnesses.

Patent, is JOSEPH S. HOOD.

In a lifting-jack, the combination, Withthe /Vitnesses: 1osupporting-frame having grooves d, as shown. XV. O. LooR,

of a sliding` rack-bar having tongues e and S. G. BRECHBILL.

